At her Harvard commencement speech, “Harry Potter” author JK Rowling offers some powerful, heartening advice to dreamers and overachievers, including one hard-won lesson that she deems “worth more than any qualification I ever earned.”

JK Rowling penned the bestselling Harry Potter page-turners — a spellbinding, seven-installment fantasy of wizards, warlocks and decidedly British texture that brought her from rags to riches.